Ergodyne Chill Its 6612 Hard Hat Top Pad — Moisture Wicking Crown Comfort TICONN 1497 Retire a lens once scratches stretchy twin leg with Retire a lens once scratches enter your line of sight a scratched safety or reader lens no longer performs fully The continuous filtered airflow maintains a positive pressure environment inside the headcover regardless of head shape or facial hair — ambient air is displaced by filtered air flowing out of the headcover at the perimeter rather than entering through a seal Safety first: any accessory that goes inside a hard hat must sit under the suspension without changing how it seats — the air gap between shell and skull is the protection The 6612 lines the crown with wicking material that absorbs sweat where it forms